[swift-evolution] Testing enum cases with associated values

[Anton Zhilin]

AFAICS, Andy needs not default implementations of Equatable, but
cases-as-optional-properties—this topic has also been discussed on the list.

enum Result {
    case success(Int)
    case failure(String)
}

let r: Result = foo()

let x: Int? = r.success
let y: String? = r.failure

assert(r.success == Optional(42))
assert(r.failure == nil)

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